怎样挂载硬盘

怎样将设备文件卸载

unmount [-fn] 挂载点
-f 强制卸载
-n 不更新 /etc/mtab 的情况下卸载
unmount /mnt/flash

文件系统 NFS

Network File System

挂载上了，但是 df -h 看不到

挂载的时候需要添加 -o nfsvers=2 或者 -o vers=2
nfsvers=2 or nfsvers=3 — Specifies which version of the NFS protocol to use. This is useful for hosts that run multiple NFS servers. If no version is specified, NFS uses the highest supported version by the kernel and mount command. This option is not supported with NFSv4 and should not be used.